A is a solution of trioxonitrate (v) acid of no concentration. B is a standard solution of sodium hydroxide containing 4 gram per dm³ of solution. 25cm³ of portion of solution B require an average of 24cm³ of solution A for complete neutralization. State with a reason, a suitable indicator for the titration.
1) HNO3
2) NaOH
3) HNO3+NaOH=NaNO3+H2O
Signum - phenolphthalein
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